Looking to get into a Ramcharger...

I would recommend the 360 over a 318 because of the extra torque to get the heavy truck moving.

We had a 79 Warlock II when we were in high school. We rebuilt the engine and it went from 9 mpg while towing the Superbird on a trailer to 11.5 mpg after rebuilding the 360 and it had much more power. It was fun to drive. Our non-Mopar freinds were very impressed with the power it had.